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When your Ferroli boiler isn't working as it should, it can disrupt your daily routine. Luckily, Ferroli boilers come with a built-in diagnostic system that displays an error code on the screen when something is wrong. This guide will help you understand those codes, what they mean, and how to fix them.

If you're facing boiler issues and need a quick solution, our expert engineers are just one click away. You can also get a fixed price for boiler repairs online in under 20 seconds.

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How to Spot Ferroli Boiler Problems?

If your Ferroli boiler is acting up, don't panic; it might just be showing a fault code that's easy to deal with once you know what to look for. Here's how to identify and respond to those error codes step by step.

Step 1: Look for the Fault Code

Most Ferroli boilers have a digital display screen that shows a fault code (such as F37, A01, etc.) when an issue occurs. If your model doesn't have a screen, keep an eye out for flashing lights on the control panel. These usually follow a pattern to indicate a specific fault.

Top Tip: Write down or snap a photo of the code before you try anything — this can help you (or your engineer) later.
Step 2: Try a Quick Reset

Many minor boiler faults can be fixed with a simple reset. Here's how:

  • Find the reset button (usually marked with an "R" or a small flame icon).
  • Press. Then, hold it for about 5 to 10 seconds.
  • Wait to see if the boiler restarts and returns to normal.

If your boiler fires back up and works fine, the issue might have just been a one-off glitch. If the code comes back, it's time for a deeper look with a professional boiler repair service.

Step 3: Check the User Manual

Your Ferroli boiler manual will include a list of all the fault codes and what they mean. If you still have it tucked away in a drawer, grab it and look up your code for guidance.

Still, seeing an error?
If the code keeps reappearing or your boiler won't reset, it may be time to call in a Gas Safe-registered engineer. They'll know exactly what to do and can get your heating, hot water, and running safely.

Common Ferroli Boiler Fault Codes and How to Fix Them

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Some boiler problems occur frequently and are not exclusive to Ferroli models. However, understanding these common fault codes will help you identify the issue and take the necessary steps toward a solution.

How to fix the F37 Error Code?

The F37 fault code indicates low water pressure within your boiler system. This is one of the simpler issues you can fix on your own. Here's how:

  • Check the pressure gauge on your boiler. It should typically read between 1.0 and 1.5 bar.
  • If it's below that level, you can re-pressurise the system by adding water using the filling loop. Refer to your boiler's user manual for specific instructions on this process.
  • Once the pressure is restored, reset your boiler and the code should clear.

Still unable to fix it? You could have a damaged pressure sensor that requires an engineer's intervention.

How to fix the F3 Fault Code?

The F3 fault code signals that the safety thermostat has tripped. This can happen due to:

  • A faulty heating sensor.
  • A lack of water circulation within the system.
  • Air is trapped in your heating system.

This one usually requires an engineer's expertise. Book a professional engineer to diagnose and fix the issue as soon as possible.

How to fix the A01 Error Code?

The A01 error code occurs when the boiler fails to ignite due to:

  • A lack of gas supply.
  • Faulty ignition electrodes.
  • A malfunctioning gas valve.
  • Insufficient system power.

Here's how to troubleshoot:

  1. Verify your gas supply is working. Are other gas appliances functioning as expected?
  2. Check that your boiler isn't showing any signs of electrical issues, such as power surges or flickering displays.

If the issue persists, it’s best to call a boiler repair expert near you to professionally inspect and repair your heating system.

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How to fix the D1 Fault Code?

The D1 fault code is less common and not officially listed in Ferroli's manuals. It appears to stem from an issue with the diverter valve, leading to restricted water flow. This issue almost always requires a skilled engineer to take a closer look.

Full List of Ferroli Boiler Error Codes

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Ferroli boilers are designed to make troubleshooting straightforward by displaying specific fault codes. Below is a complete list for quick reference:

Error Code Fault Description
A01 Ignition problem – may be caused by a faulty electrode, no gas, or insufficient power.
A02 Flame detected with the burner off – possible electrode or PCB (printed circuit board) fault.
A03 Damaged heating sensor or issues with water circulation or air inside the system.
F04 Incorrect card parameter setting.
F05 Air pressure switch problem; flue baffle might be obstructed or incorrect.
A06 No flame after ignition; this could be due to gas pressure issues or obstructed flue ducts.
F07 Faulty air pressure switch causing incorrect operation when the fan is activated.
A09 Faulty gas valve or disconnected wiring.
F10 Delivery sensor error caused by short-circuited or disconnected wiring.
F37 Low system water pressure or a faulty pressure switch.
F43 Exchanger protection was activated due to a lack of water circulation or air blockage.
F34 Low supply voltage (below 170V).
A15 Repeated F05 faults caused by an air pressure switch issue.

For a complete breakdown of every error code, including model-specific faults for Modena HE Combi and System boilers, see the full table at the end of this post.

If your boiler displays a fault code not listed above or you're still unsure what's wrong, don't attempt to diagnose the issue yourself. Contact one of our certified gas heating engineers today.

Why Error Codes Matter

Error codes act as a guide to pinpoint the issue in your Ferroli boiler. Recognising and understanding these fault codes means:

  • You can rectify minor issues yourself without extra cost.
  • You know when to call in an engineer for more complex problems.
  • Your heating and hot water are restored faster, minimising disruption to your home.

Still, having trouble? Even the best boilers wear out over time. It might be a good idea to upgrade to a new, energy efficient model. You can get a free, fixed-price quote for boiler replacement online now.

Find out how much a new boiler installation cost booking us online.

When to Call a Professional Engineer?

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While some issues, such as low water pressure (F37), can be resolved by yourself, most boiler problems require professional help to be fixed safely and effectively. Working with gas or electrical systems without proper training can be dangerous.

If your boiler displays persistent or multiple error codes, trust our qualified engineers to get your heating up and running again. With transparent pricing and efficient service, we make boiler repairs hassle-free.

Book your fixed-price repair today with no hidden costs.

Don't Ignore Boiler Warning Signs

Ferroli boiler fault codes highlight operational issues that need attention to ensure your boiler runs smoothly. Paying attention to boiler error codes and fixing them can prevent minor problems from turning into major repairs or a complete boiler breakdown.v

If your Ferroli boiler is showing signs of wear and tear or frequent error codes, it might be time for an upgrade. A new boiler can save you money on repairs and reduce energy bills over the long term.

Get a personalised boiler replacement quote online in just a few seconds.

Be sure to check out our blog on the most searched boiler repair questions in London for helpful insights and answers to the most common boiler issues homeowners face. It’s a great way to expand your boiler know-how!

Get lightning fast quotes. Alternatively, we do offer site surveys where needed.